In C#.NET multiline textbox, on enter key press, how to stop line change?

Hi,
In my window application, when I press enter key in multiline textbox, then I want to make clear the textbox value as well as cursor in first line with this property:
wordWrap==true;
But now when I press the enter key, the cursor gets the position in next line. I want the application just like yahoo chat textbox enter key event.

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